Default Cisco Wireless Unified Communications Endpoints Marking for Video Media Traffic or Video RTP Traffic

C.

When configuring network-level quality of service (QoS), Cisco video endpoints (including Cisco Unified IP Phone 8900 and 9900 Series and Cisco TelePresence System EX Series devices) generally mark traffic at Layer 3 according to Cisco general QoS guidelines related to voice and video packet marking (video media as DSCP 34 or PHB AF41; call signaling as DSCP 24 or PHB CS3) and therefore these devices can be trusted.

Cisco Unified Communications endpoints can mark the Quality of Service (QoS) field in the IP header of their media traffic with a Differentiated Services Code Point (DSCP) value. This allows network devices such as routers and switches to classify and prioritize the traffic based on its type and importance.

In the case of video media traffic or video Real-time Transport Protocol (RTP) traffic, the default DSCP marking used by Cisco Wireless Unified Communications endpoints is DSCP 34.

DSCP 34 is also known as AF41, which stands for Assured Forwarding (AF) class 4, marking 1. This DSCP value indicates that the traffic belongs to the AF4 class, which provides a medium-high priority for applications that require low latency, such as voice and video.

The other options listed in the question are:

A. DSCP 8: AF11, a low-priority class for non-real-time applications like file transfers. B. DSCP 24: AF31, a medium-priority class for applications like email and web browsing. D. DSCP 46: EF, a high-priority class for real-time applications like voice and video that require the lowest possible latency.

Therefore, the correct answer is C. DSCP 34.